An Evaluation of a Composite Model for Predicting Drop-Drop Collision Outcomes in Multidimensional Spray Computations

2002-01-0943

03/04/2002

Event
SAE 2002 World Congress & Exhibition
Authors Abstract
Content
The standard model for predicting the outcome of drop-drop collisions in sprays is one developed based on measurements in rain drops under atmospheric pressure conditions. This model includes the possible outcomes of grazing collisions and coalescence. Recent measurements with hydrocarbon drops and at higher pressure (up to 12 bar) indicate the possibility of additional outcomes: bounce, reflexive separation and drop shattering. The measurements also indicate that the Weber number range over which bounce occurs is dependent on the gas pressure. The probability of a drop-drop collision resulting in bounce increases with gas pressure. A composite model that includes all these outcomes as possibilities is employed to carry out computations in a constant volume chamber and in a Diesel engine. A sub-model for bounce that includes the pressure effects is also part of the composite model. Comparisons of results obtained with the composite model are compared with those obtained with the standard model. Sauter-mean-diameter variations and mixing characteristics are studied under non-vaporizing, vaporizing and combustion conditions. It is shown that the probability of coalescence is noticeably reduced with the new model compared to the model based on the work of Brazier-Smith et al.
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-0943
Pages
11
Citation
Aumann, R., McCracken, M., and Abraham, J., "An Evaluation of a Composite Model for Predicting Drop-Drop Collision Outcomes in Multidimensional Spray Computations," SAE Technical Paper 2002-01-0943, 2002, https://doi.org/10.4271/2002-01-0943.
Additional Details
Publisher
Published
Mar 4, 2002
Product Code
2002-01-0943
Content Type
Technical Paper
Language
English